ACANTHOUON. 1G1 



Genus ACANTHODON, Gruerin. 



Acanthodou, GuSrin, Rev. Zoo/. 18.38, p. 10; Simon, Hist. Nat. 



Araiyn. i. p. 91, 1892 . 

 Idiops of recent author* up to 1892 (not of Perty). 



Carapace polished, scantily hairy ; fovea large, strongly pro- 

 curved ; head high ; anterior lateral eyes situated in the middle of 

 the anterior border of the carapace : the remaining eyes forming a 

 group far behind the anterior edge of the carapace. Mandible 

 powerful ; rastellum consisting of stout spines borne upon a distinct 

 prominence. Sternum with posterior sigilla obsolete. Legs in 

 female short and stout, claws armed with 1 or 2 large basal teethj; 

 distal segments of legs not scopulate, those of the anterior pairs 

 and of palpi thickly spined laterally ; tibia of 3rd not depressed 

 above at base. Apical segment of posterior spinning-mam illce 

 short. 



d • Carapace lower, rugose ; legs long and slender. 



Type, A. petiti, Guerin. 



Distribution. S. America ; Tropical Africa ; Syria, Arabia , 

 India and Burma. 



Synopsis of Indian Species. 

 Females. 



a. Coxa of 4th leg without band of spinulea ; tibia 



of 3 rd longer than wide. 



a 1 . Ocular tubercle elevated in front A. crassus, p. 161. 



b l . Ocular tubercle not elevated in front A. opife.c, p. 162. 



b. Coxa of 4th leg with baud of spinulea below ; 



tibia of 3rd as wide as long. 

 a 2 . Eyes of posterior line subequally spaced . . A.fortis, p. 163. 

 2 . Eyes of posterior line unequally spaced .... A. constructor, 



[p. 163. 



Males. 



a. Tibia of 1st leg armed with a stout, pointed, 



Bud bent spur, and a tubercle behind it .... A. constructor, 

 b Tibia of 1st leg armed with a low prominence [p. 163. 



tipped with a long spine, and a small tubercle 

 above it. 

 a'. 4th leg only a little longer than the 1st ; 

 pro tarsus of 1st strongly concave in its 



basal half on inner side A.fossor, p. 164. 



b'. 4th Leg considerably longer than 1st; pro- 

 tarsus of 1st weakly concave in its basal 

 half on inner side A. designatus, p. 164. 



131. Acanthodou. crassus, Simon, Ann. Mus. Oenova, xx, p. 357 

 issi (Idiops): colletti, 0. /'. Cambr. P. Z. S. 188'.), p. 37, pi. ii' 

 tig. 2 (Idiops). 



2. Colour: carapace, etc. mahogany-red, legs paler; abdomen 



M 



